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File:Milky Way Arms.svg

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    Original file (SVG file, nominally 512 × 483 pixels, file size: 29 KB)

    Summary

    Description

    A "God's view" map of Milky Way as seen from far Galactic North (in Coma Berenices). The star-like lines center in a yellow dot representing the position of Sun. The spokes of that "star" are marked with constellation abbreviations:

    Ori Orion
    Aur Auriga
    Cas Cassiopeia
    Cep Cepheus
    Cyg Cygnus
    Aql Aquila
    Sgr Sagittarius
    Nor Norma
    Cen Centaurus
    Vel Vela
    Pup Puppis
    CMa Canis Major

    The spiral arms are colored differently in order to highlight what structure belongs to which arm. H II regions are marked as dots colored in the same color as their spiral arm. They come in three sizes, measured by the excitation parameter U:

    1. small - U > 200 pc cm-2
    2. medium - 200 > U > 110 pc cm-2
    3. large - 110 > U > 70 pc cm-2
    Date (UTC)
    Source

    A redevelopment of Image:Milky Way Arms-Hypothetical.png: details about method below.

    User:YUL89YYZ, User:Ctachme, Kevin Krisciunas, Bill Yenne: "The Pictorial Atlas of the Universe", page 145 (ISBN 1-85422-025-X) and µOR.
    Author User:Rursus
    Other versions

    Derivative works of this file:  Milky Way Arms.png [edit]

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    Method

    The original image, Image:Milky Way Arms-Hypothetical.png, was dloaded and rotated by gimp, so that Sun is up, as is custom on Milky Way "God's view" maps. The image is then saved and imported into inkscape, and used as a template for vector editing by hand. Thereafter added:

    a. 30° sectors around Sun, named for constellation in that direction in the galactic plane, dbl check!
    b. names for MW arms as per YUL89YYZ/Ctachme Checked with [1][2][3]
    c. HII-regions registered by radio and optical, as per Krisciunas/Yenne, secondary sources
    d. center of galaxy and galaxy bar, Checked with [1]
    e. intensity maxima of arms, as per Krisciunas/Yenne secondary sources

    References

    1. ↑ a b Momany, Zaggia, Gilmore, Piotto, Carraro, Bedin, Angeli, A&A press release, Released on March 16th, 2006, Last retrieved: 9 jun 2007
    2. ↑ Solstation.com: Outer Disk Ring? archive copy at the Wayback Machine, review of a letter to New Scientist from Naomi McClure-Griffiths et al. (Both latest retrieved 9 Jun 2007)
    3. ↑ newscientist.com - Jenny Hogan: Milky Way spiral gets an extra arm, last retrieved 9 jun 2007

    Licensing

    GNU head Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled GNU Free Documentation License.
    w:en:Creative Commons
    attribution share alike     		This file is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported license.
    You are free:
    • to share – to copy, distribute and transmit the work
    • to remix – to adapt the work
    Under the following conditions:
    • attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
    • share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.
    This licensing tag was added to this file as part of the GFDL licensing update.

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    data size

    190,600 byte

    height

    580 pixel

    width

    614 pixel

    media type

    image/svg+xml

    checksum

    d53d462659405ad73392fd0d5780cda9bbb20ddb

    determination method or standard: SHA-1

    File history

    Click on a date/time to view the file as it appeared at that time.

    Date/TimeThumbnailDimensionsUserComment
    current16:07, 4 November 2025Thumbnail for version as of 16:07, 4 November 2025512 × 483 (29 KB)Marnanelimages of text to text; sorted objects into named layers; optimised with scour
    19:21, 9 June 2007Thumbnail for version as of 19:21, 9 June 2007614 × 580 (186 KB)Rursus
    19:07, 9 June 2007Thumbnail for version as of 19:07, 9 June 2007614 × 580 (186 KB)Rursus
    12:58, 9 June 2007Thumbnail for version as of 12:58, 9 June 2007592 × 580 (183 KB)Rursus
    12:25, 9 June 2007Thumbnail for version as of 12:25, 9 June 2007592 × 580 (170 KB)Rursus
    10:32, 9 June 2007Thumbnail for version as of 10:32, 9 June 2007592 × 580 (201 KB)Rursus
    08:58, 9 June 2007Thumbnail for version as of 08:58, 9 June 2007592 × 580 (237 KB)Rursus{{Information |Description=A redevelopment of Image:Milky Way Arms-Hypothetical.png |Source=User:YUL89YYZ, User:Ctachme, Kevin Krisciunas, Bill Yenne: "The Pictorial Atlas of the Universe", page 145 (ISBN 1-85422-025-X) and µOR. |Date=~~~~~

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